EFFECTS OF INBREEDING AND CROSSBREEDING. 53 
TABLE 20.—Average daily rate of gain between birth and weaning (33 days), in grams. 
Average in litters of each size and the index (see Table 18). Inbreeding and crossbreeding experiments, 
1916-1919.] 
Size of litter. 
Experiment. Index. 
1 2 3 el ee 6 7 
: ORES ER ee Oe ee ee ee 9 ee 3.10 
_), SRB Be ae LEE 5. 06 4,54 3.99 3.67} 3.05 4, 29 
=| TAD ae eS 4.32 7 Bae ty (pe pe (ee hy [Ee ai 3.73 
= + Se ee Sa oe 4.44 | 3.92 Ae pees. 4,18. 
eeeaee ree: Sere ee. Foe ie eat 3.90/ 3.09| 2.80 3.91 3.51 
tage AA DME ne 4.50 3. 48 9.-G8 4!) 8D 2.70 | 3.30 
aq EES LSS SSS —S 
oS nbc legume ee aa EPA 2 | 4543] 3.85 3.36] 3.09/ 3.09 3. 64 
ER renin Ao me age eteccpinata | 5.15] 4.31] 3.82] 3.40 3. 10 4,12 
“SES, GB ak 5.51 | 4.93 3.98| 3.66] 3.02 4.49 
OE 5.49}  5.06| 4.23] 3.53 3. 45 | 4.61 
"SOA pat oe Ri | Sistah Naers if) os | 4.49 
EE EE eared 5. 36 4.63]. 4.07| 3.46 3.24 | 4, 37 
ER ot aS 5.68 4.58} 4:73 | 3.40 4.09 | 4.62 
Pari steam chon, ne eee Pee 5.16 4.69} 4.14] 2.62 4.99 
(PRS ee Se 1*: 5730 5.20} 4.63 3.90} 4.04 | 4.90 
eee ee 5.49 | a 6 i ee RS A lal Se 4,35 
TABLE 21.—Average weight at weaning (33 days), in grams. 
{Average in litters of each size and the index (see Table 18). Inbreeding ‘and crossbreeding experiments, 
1916-1919.] 
l 
| Size of litter. 
Experiment. , _ Index 
eB verde: 3 4 | = yagi a fn, Oeh 
Ee Se: ORAS LEC ON | Aee bi aoe 
© Sekt Ae Se ET et 213.2 | 182.4| 163.3 ol Ties oS pp ois © as eRe fe ees" 
ee eae AG eT BS iS | 1238.5) 206.84 WRI] CAGES |e oe 225.2 
7 is a a eee 246.1 | 225.0) 177.7] 160.9 |..-...... SSeS, iar eee 201.9 
Tees ye ee eee ko 1. 523.8 | 908.6.) “175161411580 |. ee) ee 
ees Ce ee ee 233.3 | 205.1] 170.3 153.2 Trou bet ead Bee IFS | 189.1 
Gili sa ee eee ee ee Oe ie ee e-em | 185.0 
25 he ee «ae 247.1 
ey See es ae 271.7 
Choe ae Sat a ae 292. 9 
_ a SEES Re 292. 6 
“oD ee ee ee 2 279.8 
eee Se RE ae 284.0 
es ee oe oe 292, 8 
ee ee 317.5 
“See 0 S eee 303. 4 
"on ee ie 292. 6 
